If you feel the momentum during the change of directions, you will improve drastically.
The lob shot is all about adding loft so it is important that your left hand does not fight the right. Here is how you work your left hand.
Knowing how the handle and bounce works are the first things to gain familiarity with for hitting these lob shots. Here's how you practice that.
Now that you know the most important patterns to the L to L, here's how to turn that into a full swing.